Auger bit or drill



March 18,1924. 1,486,898

H. HUNDRIESER V AUGER BIT 0R DRILL Filed Aug. 26. 1920 [/7 rervr'or' HHu/vw/izser Patented Mar. 18, 1924.

UETED STATES HANS HUNDRIESER, OF HAHNSER, NEAR BERLIN, GERMANY.

AUGER BIT OR DRILL.

Application filed August 26, 1920. Serial No. 406,143.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT. L.,1313.)

T 0 all whom it may concern.

Be it known'that I, HANs HUNDRIESER, a citizen of the German Republic,residing at Hahnser, near Berlin, Germany, have invented certain new anduseful Improvements in Auger Bits or Drills (for which I have filedapplication in Germany Aug. 9, 1915, Patent No. 303,030; Germany, Mar.16, 1918, and Germany, July 26, 1919, all in the name of Alfred Stapf,Berlin, Germany, and Hans Hundrieser, with applicants consent andknowledge), of which the following is a specification.

The invention relates to an improved drill or auger-bit for biting ordrilling holes into stones, rocks and the like, and in particular to anauger or drill of the kind in which resistances are formed within therecesses of the cutting edge or bit of the tool. In augerbits of thiskind the boring action and the efliciency of the tool is badlyinfluenced by the rock or material remaining between the grooves or cutsproduced in the rock, stone or the like, since the said left rock or.material is pressed against the front or from the outside to the insideof the tool, so that the latter has but a slow advance or feeding.

The object of the present invention is to provide a tool of the kindwhich will have a relatively quick feeding or, in other words, which maybe driven with a higher speed and a lower or less expenditure of powerthan is available for drills heretofore in use.

This object is realized by arranging and shaping the said resistances orbreaking faces in a manner that they will act like wedges in a directionfrom the axis or center outwardly with respect to the feeding directionof the tool, whereby the remaining or left rock, stone or other materialis removed by pressure in the direction from the interior to theoutside.

Referring to the accompanying drawings, which illustrate severalembodiments of the invention, to the details of construction of which,however, the invention is not limited.

Fig. 1 represents an elevation of one embodiment of the invention.

Figs. 2 to 4 are an elevation, a plan and a side View, respectively, ofa further em bodiment having a central tooth out of axial alignment,

Fig. 5 is a modification thereof,

In Fig. 1 the cutting edge of the augerbit has projecting teeth 2 formedby recesses 3 cut into the edge. The bottom faces of said recesses 3sloping from the centre to the outside, afford breaking planes or faces4. On entering into the stone, rock or the like the teeth 2 will cutconcentric grooves, leaving within the recessed portions 3 the stone,rock or the like in the shape of cylindrical projections. On the furtheradvance of the tool these cylindrical projections will be removed bysaid breaking faces 4, owing to the angular or sloping relation of thelatter to the longitudinal axis of the tool acting like a wedge from theinside to the outside. The auger-bit 1 is secured within the slotted end5 of the driving shaft or holder 6 by means of a detachable boltor rivet9. The two jaws forming the said slotted end are preferably given aconical shape or contour and the tool will be more firmly clasped bysaid jaws if, as shown in the drawings, the slot 8 extends into the bodyof the shaft below the base 7 of the conical jaws. The bolt or rivet 9is'but slightly riveted so as to be readily detachable for the removalof the auger-bit from the holder or shaft. This mode of securing thetool to the holder 6 affords a perfectly firm connection between theparts without presenting any resistance to the regular discharge of thebore-dust.

Referring to Figs. 2 to 4, the boring blade 12 carries a central cuttingtooth 13 located laterally with relation to the vertical axial line AAof the tool, the breaking edge of said central tooth 13, that is theedge, which at the feed movement of the drill comes into contact withthe material standing between the grooves formed by the teeth of thedrill having an oblique direction from the top of said tooth down to thebottom of the adjacent tooth 15. As will be seen from Fig. 3, the saidbreaking edge 14 to 14 will be working on one side, and the breakingedge 14 to 14 on the other side of the augerblade. One of the twolateral teeth 15, preferably is slightly narrower than the other lateraltooth 16, the object of this construction being to enable the remainingcylinder between the cutting tooth 16 and the central tooth 13 to beremoved by the breaking edge 14 without jamming. The said tooth 15having preferably a slightly greater length than the tooth 16 may serveas a first-cutter. The inside cutting edge 15 of the tooth 15 may have asloping shape, as shown. in Fig. 5, instead of being vertical as in Fig.2.

The mode of securing the auger-bit to the driving shaft is the same, asbefore described with respect to Fig. 1.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is- 1. An auger-bit or drill for boring rocks,stones and the like, comprising a drilling tool, recesses in the cuttingedge thereof and resistances in said recesses, formed by slope breakingfaces adapted to operate in the direction of the advance or feeding ofthe tool like a wedge from the longitudinal axis of the tool towards theoutside.

2. An auger-bit or drill, comprising a drilling tool, recesses in thecutting edge thereof, resistances in said recesses, a holder or shaftfor said tool, two conical jaws at the end of said'holder, a slotbetween said jaws to receive the tool and a detachable bolt or rivettherein to secure the tool to the holder 'or shaft.

In testimony whereof I affix my signature in presence of two witnesses.

HANS HUNDRIEEfiER. lVitnesses N. HoRs'rER, K. VVOLDUSKV

